Neptis dumetorum is a butterfly in the family Nymphalidae.

The species of this small group are confined to the Mascarene and Comoro Islands and do not seem to occur on Madagascar, but closely approximate to Neptis saclava, which is found there.

The discal band of the forewing is twice interrupted, in cellules 1 b and 4, and discal spot 4 is absent or small and joined to the spot in 3.

In the males the underside of the forewing at the hindmargin is grey with a strong mother-of-pearl gloss as far as vein 2.

[3] Known host plants of this butterfly are: Acalypha wilkesiana, Trochetia granulata, Sida carpinifolia (Malvaceae) and Acalypha integrifolia (Euphorbiaceae).